Sewing-machine motor.



No. 820,327. PATENTED'MAY 8, 1906.

- H. R. WBLLMAN.

SEWING MACHINE MOTOR.

v APPLICATION FILED AUG.17, 1905.

3 SHEETS-SHEET 1.

PATENTBD MAY 8, 1906.

H. R. WELLMAN. SEWING MACHINE MOTOR.

APPLICATION FILED AUG?. 17. 1905.`

a SHEETS-SHEET 2,

Mm B14-Lg No. 820,327. PATENTED MAY 8, 1906. VH. R. WBLLMAN.

SEWING MACHINE MOTOR. rrmonlon FILED AUG. 11. 1905.

3 SHEETS-SHEET 8.

l @ro/d Y ssA HAROLD R. WELLMAN, OF RIVERSIDE,

ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SEWING-MACHINE MOTOR.

Specification of Letters Patent.

Patented May 8, 1906.

Application led Augut 17, 1905 Sll NO- 274,606.

Tu a/ZZ whom it may concern.'

Beit known that I, HAROLD R. WELLMAN, a citizen of the United States, residing at Riverside, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Sewing-Machine Motors, of which the following is a full, clear, concise, and exact description.

My invention relates to electric motors of the class designed for running sewing-machines, and constitutes an improvement over my Patent No. 690,334, granted December 31, 1901.

My improvement herein relates more particularly to the bracket of the motor, the manner of mounting the motor by said bracket upon the sewlng-machine table, and the compact arrangement and disposition of the several parts. The motor is placed beneath thefcounter-shaft and belowl the sewing-machine table." Frictional engagement between the driving-wheel of the motor and the driven wheel of the counter-shaft is main# tained by a spring-thrust exerted, primarily, against the lower endl of themotor-shaft.

The starting-switch is adapted to open and close its contacts with asnap, and the working parts thereof are 'protected by an inclosing shell, andthe entire switch mechanism is securely mounted directly upon the' frame of the motor. Pressure on the treadle first acts to operate the snap-switch. The spring of the ,snap-switch 1s `considerably less in strength or tension than is that of the s ring between the frame of the motor an the transmittel -bracket,' and hence the snapswitch will be operated to start the motor before the driving-disk is moved to come into radial engagement with the driven wheel upon the counter-shaft. Further pressure upon the treadle after the motor has been started throws the driving-disk of the motor` into greater radial engagement with the driven wheel, and thus increases the speed of said driven wheel. The counter-shaft has its bearings in the transmitter-bracket frame.

I employ a ball-bearing s' ring-thrust of well-known construction, suc s ring-thrust being utilized to press the riving-disk against the driven wheel of the countershaft. Y

The form of snap-switch which I have shown is the invention of another. I have shown this form, as I have found it to be well ada ted for the service, though other forms wor successfully.

My invention will be more readilyunderstood by reference to the accompanying drawings, in which- Figure 1 is a side elevation illustrating my motor clamped to the rear of a sewing-machine .table. Fig. 2 is a plan view of the same. Fig. 3 is a plan view showing the transmitter-bracket yand the driving-disk removed, the driven shaft being shown in section. Fig. 4 is a rea-r elevation of my motor, Athe transmitter-bracket being shown in 'section and the operative position of the motor being indicated by dotted lines. Figs. 5 and 6 are detail views of the snap-switch and the casing thereof. Fig. .7 is a detail sectional view-of the ball-bearing thrust.

Like parts are indicated by similar letters of reference throughout ythe different figures.

The frameor bracket a is shown securely clamped to the machine-table by clamp screws b and c. This bracket -is provided with bearings for the counter-shaft d, on

.which are mounted the driven wheel e and the pulley or sheavef. The motor 1s pivotally mounted upon the bracket a, as indi.

cated at g g, at the lower extremities of the downwardly-projecting arms h h; The driving-diskfi1s secured u on the end of the mo-` tor-shaft c. This sha 1c is pressed u wardly by means of the ball-bearing thrust (Illustrated in Fig. 7.) The'v upper surface of the disk 'i is convex to conform to the pivotal mounting. of the motor in order that as the motor is tilted Ithe frictional engagement with the driving-wheel will be maintained.

The upper end of the chain` m is attached to'the spring-actuated switch-lever n of the snap-swltch o, and the lower end of such chain will be attached to the treadle of the sewingmachine, which treadle is not illustrated. The operation'of the snap-switchwill be understood by reference to Figs. 5 and 6. When the lever n is moved to the position indicate'cl b dotted lines, the movable lever carig'ing t e contact o will be closed upon the fixe contact o2 of said switch.l This action is brought about when the pin o3, which'is in engagement en of link. o4 past the central point o6 of the pivoted contact-lever o-t hat is to say, the

ICO

with the link o, carries the freel `gularly-dispojsed rictional e stud o3 is mounted on the Llevera and passes lever o and thespri closethecontacts wit a snap,A `When pressure is rernovedfrom the chain, the contacts are opened with a snap to assume theirnormal oropen position.y vThe spring p between thebracket and the motor-frame should be of greater .strength than the V spring of the snap-switch. This spring 'p tends to hold the friction-.disk 'fi with its center in contact with the driven-wheel e, in which positionne motion'will be'impa'rtefd to Said driven wheel orto ,the countershaft'.l lclaim u 1. The combinationwith ya sewing-Ina'- chine table, of a bracket secured to saidy table and having arms dependin beneath the table, a driven wheel mounte on said bracket, a Inotordevice ivotally mounted beneath the table on saidpdependin arms, a drivingwheel of said 'motu angular y disposed to the driven wheel and having frictionall engagementtherewith, and means for varying the speedgof rotation of the drivenl wheel.4 4

"2. In a sewing-machine motor, the combination with .a table, of a bracket secured to said table, a counter-shaft having bearings in said bracket and carrying a drivingpulley and a driven wheel forimparting a yrotary motion to said' shaft and pulley, a vmotor mounted Iin said ,bracket beneath saidv coun.- terfshaft and below said table, adrivingwheel operated byfsaidmotor andhaving anagement with the driven wheel, and means or placing said pivotal engagementy with the link o4 to `the right andyback of thel o, willat once act tol driving-Wheel into operative relation with the y driven wheel.

,spring normally holding said driving-wheel out of operative relation to the driven Wheel', a switch mounted on the frame of the motor .for closing the circuit o f the motor, and

vmeans whereby said switch is rst operated and'said motor then tilted toplace the driving and driven wheels into operative engage# ment.

4. ln a sewing-machine motor, the combination with a table', of a bracket secured to said table and having depending arms, an electric motor ivotally mounted on said depending arms beneath the table, al countershaft having bearings in said bracket and carrying a xdriving-pulley, a driven wheel keyed to sald counter-,shaft for imparting a rotary motion to said shaft and pulley, a driving-wheel adapted to be operated by said motor, a spring normally holding said drivingwheel out of operative relation tothe driven wheel, a switch mounted on the frame of the motor for yclosin thecircuit of the motor, and means where y said switch is first operated and said motor then tilted `to place the driving and driven wheels into operative relation.

In witness whereof I hereunto subscribe my name this 26th day of July, A. D. 1905.

HAROLD R. WELLMAN. 

